Machine



2 Sheets-Sheet 1.

B. B'. BROWN. ADDING MACHINE.

Patented Oct. 19, 1869.

2 Sheets-Sheet 2.

B. B. BROWN.

ADDING MACHINE.

No. 95,876. Patented om.. 1 9, 1869.

liiitted hnelt BENJAMIN B; BROWN,

0F DELAWARE, OHIO.

Lettersv Patent No. 95,876, dated October 19, 186:).

MPROVB'MBNT 1N @DNG-MACHINES.

Thc Schedule referred to in thou Letters Patent and makin; part of theum To all whom it may concmz:

Beit known that I, BENJAMIN B. BROWN, of Delaware, in the county ofDelaware, in the State of Ohio, have invented a n ew and' useful Machinefor Calculoting in Figures', and I do hereby declare that thc followingis a full and exact description thereoi', refer- -ence being had totheaccompanying drawings, and to the letters of reference markedthereon.

The nature of my invention consists in enabling, any person, by means ofthe instrument, to add figures ip any number and to any'arnount, andalso in multiply them.

To enable others skilled in the art to make and use my invention, Iw`ill proceed to describe its construe; tion and operation.

It consists of a box of such-size as may be desired, say one foot inlength, eight or ten inches in width, and three inches in depth, havinga back and face to it, leaving about three inches between them. The faceof the box 'should be white. In the centre ot the box is a. centre arboror metalpost, one end in a socket in the back board, and projectingabout an inch through the front board ofthe box, scid metal pin easilytnrning.

On the front board is a coil or scroll about three inches in diameter,permanently fixed, of wood or metal, may be cnt in the board. (See fig.1.)

Over that scroll is a circular cap, largeeuough to cover the scroll,made of stiff paper or' other material,- with a hole in the centre,fitting over the metal pin or post spoken of. The post is marked q. inFigures 2 and 1; y

Upon thiscap is' ascale of tenths, marked i, fig. 2. In the centre ofthat part of the centre arbor ormetal post a, iig. 2, projecting infront of the front board of the box, is a groove or slit.

The, index or.needle,h, tig; 2, is on a light wood or metal frame,rectangular, marked k, fig.2. The frame is about two-thirds across thecap or scroll, and about oneinch to one-haii' incliwide. The needle orindex h is attached to both end pieces oi' the frame, in the centre fcach, and lies in the slit or groove in the` centre arbor a, iig. 2.

The point of the needle, when set for use, just projects uver the edgeof the cap over the scroll a, iig. 1.

At point g, fig. 2, near upper end ol' the needle, a. small wooden ormetal keyor pin litsin a hole in needle, made for that purpose, andextends down so as the end of the key or pin will be between the coilsof the s croll a, iig. 1. (See y, fig. 1.)

On the sidi-.of thc needle or index-llame, at o ou thegtenths soule, oncap d, fig. 2, a small needle is attached, pointing to the tenths onsaid scale.

After the needle or index h, fig, 2, is put on, a washer is put over it,on the centre arbor or metal post l a, fig-2, and snialipin through overit, to. hold index to its place.

On the face of the machine, from the point of the needle' when set tobegin use, figures are painted from 0 to any desired number, accordingto the size of the machine, in circles parallel with t-he edge of thecap, and-set down regularly, so that the columns of figures willradiate.

Through the.top,of the box is the digit-slide b, figs. 2 and 3, slidingthrough grooves in sides ol the box, and over little blocks f, figs. 2and 3.

On top of the digit-slide is a small block, c, Figure 3, to prevent theslide being pulled out of the box. This slide maybe of metalor'ivood,`need not be over one inch in width, half an inch thick, and inlength nearly twice the width of the box, or may be less.

The digit-slide b extends out from the box, ou the left side ol the sameas you lisce the box. On that end of the said slide, and on the side ofit corresponding with the face of the box, are figures, from 0 to .l,painted one-half to three-quartexs of an inch apart.

At each one of the figures, and through the centre of the slide, is ahole bored, into each of which a key or small wooden or metal pin works,marked d. These keys or pins are attached to the digit-slide by acoil-spring, and when pressed upon, the small end of the said key or pinprojects beyond the digit-slide b one-quarter to one-half an inch', andwhen so pressed through,will prevent the slidebeing moved through thebox further than the key or pin so pressed upon.

When the finger is rernved, the key or pin flies back -so that the smallend of the same is even with the surface of' the digit-scale on thelower side.

Inside of" the box, and working on the centre arbor or metal post a,lig. 2, is alarge wheel; may bc nearly as large as the box; isacog-wheel; the cogs or teeth cut in on edge or wheel n, fig. 3. Behindthe wheel, and also working on metal post a, is a plate or disk, l, fi3, moving separately from the wheel; may be of meta or wood, thin.

.0n the outer edge are teeth corresponding to the teeth or cogs on thewheel, always working on the upper part of the wheel n, ig. `3. Itsouter edge or perimeter may be three inches or more,ac cording tosize ofbox; no special proportion necessary.

At bottom of the box is a spring or ratchet, q, fig. 3, working in theteeth or cogs ol' the wheel n, to prevent the wheel moving backward.

On the digit-slide, andto the right of the centre ol" that part oi' theslide within the box, is attached n. pieve of spring-steel, or it may beasninll chain. The other end is attached to the left corner of the diskor plate l. (See p, ig.3.)

To Lhc'digit-slide on the lei end, near figure O, is

attached nnothen'the other end of which is attached in those of -whel n,and turning it.

The machine should he used as follows:

Before commencing to use it, theneedle or index h, iig. 2, shouldpointto 0. Ifyon want any figure, say 5, press, the finger on key' atfigure' 5 on digit-slide; push Athe slide through the box. This keybeing pressed upon, will stopIthe slide when pushed as faras f key; thenpull back the slide; the index will point to5. Should you wish to add 9,press on the key at 9, push through the slide again and pullout, and'the index will point to 14, and so on, as desired.

The spring-wire or chain p, g'. 3, to plate @will turn the wheel n so asto move the index the number ol' figures at which the digit-slide isstopped by the key on left end of digit-slide, marked d." Now at eaehrevolution Vof the index h, g. 2, the ping, lig. 2, in upper end of theneedle, moves around one coil ofthe scroll, under the cap, and thendex'h is moved down one row of figures on the face, to set it back.ATake ont the pin g, move bock the index h, and putpin g in place again.l

On the drawing are figures, to 19o', butany desired number of figuresmay be used by having the machine large enough. The maehine may be madeof wood or metal. The scroll or coil under the cap maybe cut out on thefront board or face of the box;

What I claim as my invention, and desire to secure by Letters Patent, isThe combination of plate l, ratchet n, detent-pawl q, actuating-pwd m,chain p p, slide b, (having lng 0 and springpins d, thereon,')scroll-pin g, flame k, and

thee-plate, allconstructed and arrangedas aud fo: the

purpose specified.

BENJAMIN B. BROWN. Witnesses:

C. H. MeELnoY, C. O. LITTLE.

